Scientists estimate that for more than _______ years after cells originated,all organisms consisted of one cell.
A) 250,000
B) 2 million
C) 200 million
D) 2 billion
E) 20 billion

Question

Quizplus · Accepted Answer

Scientists estimate that for about 2 billion years after cells originated, all organisms consisted of one cell, before eventually evolving into multicellular organisms.

Scientists Estimate That for More Than _______ Years After Cells